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                [Usaco2007 Open]Dining吃饭                </h1>
                <p>时间限制：5s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：64MB</p>			</div>
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                                <h3>题目描述</h3><p><p><span style="font-size: medium">农夫JOHN为牛们做了很好的食品,但是牛吃饭很挑食. 每一头牛只喜欢吃一些食品和饮料而别的一概不吃.虽然他不一定能把所有牛喂饱,他还是想让尽可能多的牛吃到他们喜欢的食品和饮料. 农夫JOHN做了F (1 &lt;= F &lt;= 100) 种食品并准备了D (1 &lt;= D &lt;= 100) 种饮料. 他的N (1 &lt;= N &lt;= 100)头牛都以决定了是否愿意吃某种食物和喝某种饮料. 农夫JOHN想给每一头牛一种食品和一种饮料,使得尽可能多的牛得到喜欢的食物和饮料. 每一件食物和饮料只能由一头牛来用. 例如如果食物2被一头牛吃掉了,没有别的牛能吃食物2. </span></p></p><hr/><h3>输入格式</h3><p><p><span style="font-size: medium">* 第一行: 三个数: N, F, 和 D </span></p>
<p><span style="font-size: medium">* 第2..N+1行: 每一行由两个数开始F_i 和 D_i, 分别是第i 头牛可以吃的食品数和可以喝的饮料数.下F_i个整数是第i头牛可以吃的食品号,再下面的D_i个整数是第i头牛可以喝的饮料号码.</span></p></p><hr/><h3>输出格式</h3><p><p><span style="font-size: medium">* 第一行: 一个整数,最多可以喂饱的牛数. </span></p></p><hr/><h3>样例输入</h3><pre>4 3 3
2 2 1 2 3 1
2 2 2 3 1 2
2 2 1 3 1 2
2 1 1 3 3

输入解释:

牛 1:  食品从 {1,2}, 饮料从 {1,2} 中选
牛 2:  食品从 {2,3}, 饮料从 {1,2} 中选
牛 3:  食品从 {1,3}, 饮料从 {1,2} 中选
牛 4:  食品从 {1,3}, 饮料从 {3} 中选
</pre><hr/><h3>样例输出</h3><pre>3
输出解释:

一个方案是:
Cow 1: 不吃
Cow 2: 食品 #2, 饮料 #2
Cow 3: 食品 #1, 饮料 #1
Cow 4: 食品 #3, 饮料 #3
用鸽笼定理可以推出没有更好的解 (一共只有3总食品和饮料).当然,别的数据会更难.</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>Gold</p>
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